Dark Orbit is a very addicting game with many features. Dark Orbit is completelly free to play and is also a browser game so there is no need to spend time or waste computer space downloading the game.
The whole idea of dark orbit is that you a a spaceship for one of three planets and your job is to destroy other ships from other planets and also aliens. The game is quite simple and yet very complex. After playing the game for many hours you will notice alot of repetitiveness in the game. You will find yourself doing the same things over and over again. The game also has many features though and Dark Orbit continues to add more features to the game almost every month.
Overall if you play this game you will probablly enjoy it but become bored quicklly as you relize you do the same things over and over again. Although to some players i find myself playing often and enjoying the game even though i play often.
Update On Aug 30, 2009: It may be different for you but I will stop playing and then play again later. No matter what you do you can have some basic fun that should last for a couple of hours.